Hip impingement: the bone shape is common, the pain is yours.

Over a third of pain-free adults have the same hip shape you were shown on your scan. That fact changes how to think about your pain.

This page is about understanding the condition and the role the brain and nervous system can play in it. It is not a diagnosis. Your own clinicians know your case.

What hip impingement is

Hip impingement, formally femoroacetabular impingement or FAI, describes a hip in which the ball (femoral head) and socket (acetabulum) do not fit together smoothly. In cam impingement there is extra bone on the ball; in pincer impingement the socket over-covers the ball; combined impingement has both. During deep bending or rotation the extra bone can pinch the labrum (the cartilage rim) and the joint lining, and that can cause groin pain, stiffness, clicking and a loss of range of motion. It is often diagnosed in young, active people.

Diagnosis is based on symptoms, examination (especially pain when the hip is flexed and rotated inward), x-rays showing the bone shape, and MRI to look for labral tears or cartilage damage. Treatment usually starts with physiotherapy, activity modification and sometimes injections. Arthroscopic surgery to reshape the bone and repair the labrum is offered when conservative care fails.

The neuroplastic contribution

The ATNS Index of Neuroplastic Symptoms says that assessment for neuroplastic symptoms is reasonable as part of a complete evaluation of hip impingement, particularly if the symptoms or the course over time are atypical, or the response to treatment is not as expected.

Neuroplastic symptoms are real symptoms produced by learned pathways in the brain and nervous system, a sensitized alarm system, rather than by ongoing damage in the joint. They are not imaginary and not a sign of weakness. And because the brain can change, they are reversible. In hip impingement, the nervous system can contribute in a few ways:

• Being shown a scan of abnormal bone and told your hip is pinching itself can make every movement feel dangerous. That belief alone raises pain.
• Guarding and avoiding hip movement weakens and stiffens the joint and keeps the alarm on.
• If pain persists after physiotherapy or after surgery that successfully reshaped the bone, the pain pathway itself has become the problem.
• Stress, fear of re-injury and catastrophic thinking are measurable predictors of worse outcomes, as the research below shows.

Understanding the difference between hurt and harm is especially useful here, because a hip that hurts when you squat is not necessarily a hip being damaged when you squat.

What the research shows

A systematic review of imaging findings in asymptomatic volunteers pooled 26 studies and 2,114 pain-free hips. It found cam morphology in about 37 percent overall, rising to around 55 percent in athletes, and pincer findings were common too. In other words, the structural diagnosis of hip impingement is present in a large minority of people who have never had hip pain. Structure alone does not explain symptoms.

A prospective study asked what role kinesiophobia (fear of movement) and pain catastrophizing play in outcomes after hip arthroscopy for FAI. Patients with high pre-operative catastrophizing were several times more likely to have elevated pain at rest after surgery, and those with high kinesiophobia were several times more likely to have pain during activity and worse function scores. The authors suggested screening for these factors before surgery.

A separate study found that pain catastrophizing and kinesiophobia affected return to sport after hip arthroscopy, with catastrophizing scores at one year significantly higher in patients who did not achieve a meaningful improvement. Surgery fixed the bone in all of them; the brain's response predicted who got better.

These are observational studies with modest samples, so the exact numbers should be treated as approximate. But the pattern is clear and consistent: the sensitized nervous system is a real and measurable part of hip impingement outcomes.

Signs the nervous system may be part of the picture

• Pain is widespread around the hip, or has spread to the back, buttock or other hip.
• Pain is constant, even at rest or in bed, rather than only with deep bending and rotation.
• Pain persists after surgery that your surgeon says went well.
• You are afraid to move the hip and have stopped activities you love.
• You find yourself thinking the hip is ruined, or that the pain will never stop.

A solution that addresses it

There is an approach designed for the brain's contribution to pain. Often called pain reprocessing, it combines education about neuroplastic symptoms, somatic tracking (observing hip sensations with curiosity instead of fear), reducing threat around movement, a graded return to activity and sport, emotional awareness and expression, and acceptance and commitment skills. Trained clinicians deliver it, and it is increasingly available through digital programs.

Cindra is a daily AI companion built around these approaches, with daily check-ins, short practices and plain-language lessons for people whose symptoms have a neuroplastic component. If your hip pain has not followed the script, you can join the waitlist.

What to do next

Get a thorough assessment from a clinician experienced in hip conditions. Make sure other causes of groin pain have been considered, including hernia, stress fracture, and hip arthritis. Follow the physiotherapy plan you are given.

Ask a direct question: given that this bone shape is common in pain-free people, how confident are you that it is the source of my pain? And: could a sensitized nervous system be contributing? A good clinician will welcome both.

If the pattern fits, start working on the brain side now, whether or not surgery is on the table. Learn about the fear-avoidance cycle, build movement back up gradually with pacing, and practise meeting hip sensations with less alarm.

Seek prompt medical attention for a hip that locks or gives way, inability to bear weight, pain after a fall, fever, or pain with a limp in a child or adolescent.

This article is for general education and is not medical advice, and it does not diagnose or treat any condition. Persistent symptoms deserve a proper medical assessment to rule out disease or injury before a neuroplastic explanation is considered. If your symptoms are new, changing, or come with red-flag signs such as fever, unexplained weight loss, numbness or weakness, chest pain, or loss of bladder or bowel control, see a clinician promptly.